arc-bridge: Remove unused PowerObserver

components/arc/arc_bridge_service.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_
 #define COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 77 matching lines @@
     // Called whenever the ARC process is ready.
     virtual void OnProcessInstanceReady() {}
 
     // Called whenever the ARC settings is ready.
     virtual void OnSettingsInstanceReady() {}
 
    protected:
     virtual ~Observer() {}
   };
 
-  // Notifies power management-related events.
-  class PowerObserver {
-   public:
-    // Called whenever ARC requests a wake lock.
-    virtual void OnAcquireDisplayWakeLock(DisplayWakeLockType type) {}
-
-    // Called whenever ARC releases a wake lock.
-    virtual void OnReleaseDisplayWakeLock(DisplayWakeLockType type) {}
-
-   protected:
-    virtual ~PowerObserver() {}
-  };
-
   ~ArcBridgeService() override;
 
   // Gets the global instance of the ARC Bridge Service. This can only be
   // called on the thread that this class was created on.
   static ArcBridgeService* Get();
 
   // Return true if ARC has been enabled through a commandline
   // switch.
   static bool GetEnabled(const base::CommandLine* command_line);
 
@@ skipping 80 matching lines @@
 
   // The current state of the bridge.
   ArcBridgeService::State state_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcBridgeService);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_